[Q] Long range Phone-to-Phone communication - Android Q&A, Help & Troubleshooting

We all know that cell phones talk to cell-phone towers which then connect them to the rest of the telephone network. But what about situations where there are no cell-phone towers? Two people with perfectly good cell phone devices would be virtually incapable of talking to one another short of speaking to each other face to face. Connecting two smart phones via wifi or bluetooth seems a simple enough solution, but the range of these radios is significantly limited in comparison to that of the cellular modem.
The root of this question is: How do I access the modem of two smartphone and connect them together directly so that I can speak between the two of them without a cell phone tower present. This would be useful for example on a road trip with multiple cars across "dead zones."
I understand that there is a lot of proprietary bounds that may need to be crossed and that appropriate amature radio licensing will be needed potentially. This is an excellent post on a similar concept: Raw android GSM radio modem access (text/call intercept)
Would RIL allow this process, or would I need to go even closer to hardware?
I am a senior studying Computer Engineering at Brigham Young University. This is a concept I would like to explore, and I haven't been able to find too much content on the web about it.

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3G in india- Some info pls

hi
3G has come to India BSNL has launched it and to my knowledge the first test was at Chennai and is available at the metros
not at Bangalore but then bangalore is not a metro
can any one pls give more info on wat are the exact advantages on 3G mobile technology other than great internet experience and if every other mobile provider moves to this tec will we be able to use our existing phones??
Note : sorry if this is a waste of a thread i thought their mite be many like me who don't know and may be could get to know through this thread
svrhari said:
hi
3G has come to India BSNL has launched it and to my knowledge the first test was at Chennai ...[/B]
Click to expand...
Click to collapse
Not in Kolkata either, as of date. Though its launched in Haldia . And its F*&^%&* expensive, 500 bucks only for rental! data usage extra.
Hi
Below link shows the 3G tariff plan for BSNL. It looks Expensive!!!
http://s60blog.com/2009/02/bsnl-tariff-plans-for-3g-mobile-services/
im asking for info on 3G
hi
thanks for ur reply but what i want is
what is 3G about pls provide the info u have on the same so it can also be useful to the guys like me who dont know it and may be feeling shy to ask
Check this:
3G -> Features (Source : http://www.m-indya.com/3g/3g_features.htm)
PACKET EVERYWHERE
With Third Generation (3G), the information is split into separate but related “packets” before being transmitted and reassembled at the receiving end. Packet switching is similar to a jigsaw puzzle- the image that the puzzle represents is divided into pieces at the manufacturing factory and put into a plastic bag. During transportation of the now boxed jigsaw from the factory to the end user, the pieces get jumbled up. When the recipient empties the bag with all the pieces, they are reassembled to form the original image. All the pieces are all related and fit together, but the way they are transported and assembled varies.
Packet switched data formats are much more common than their circuit switched counterparts. Other examples of packet-based data standards include TCP/IP, X.25, Frame Relay and Asynchronous Transfer Mode (ATM). As such, whilst packet switching is new to the GSM world, it is well established elsewhere. In the mobile world, CDPD (Cellular Digital Packet Data), PDCP (Personal Digital Cellular Packet), General Packet Radio Service (GPRS) and wireless X.25 technologies have been in operation for several years. X.25 is the international public access packet radio data network standard.
INTERNET EVERYWHERE
The World Wide Web is becoming the primary
communications interface- people access the Internet for entertainment and information collection, the intranet for accessing company information and connecting with colleagues and the extranet for accessing customers and suppliers. These are all derivatives of the World Wide Web aimed at connecting different communities of interest. There is a trend away from storing information locally in specific software packages on PCs to remotely on the Internet. When you want to check your schedule or contacts, instead of using a software package such as “Act!”, you go onto the Internet site such as a portal. Hence, web browsing is a very important application for packet data.
HIGH SPEED
Speeds of up to 2 Megabits per second (Mbps) are achievable with Third Generation (3G). The data transmission rates will depend upon the environment the call is being made in- it is only indoors and in stationary environments that these types of data rates will be available. For high mobility, data rates of 144 kbps are expected to be available- this is only about three times the speed of today’s fixed telecoms modems.
NEW APPLICATIONS, BETTER APPLICATIONS
Third Generation (3G) facilitates several new applications that have not previously been readily available over mobile networks due to the limitations in data transmission speeds. These applications range from Web Browsing to file transfer to Home Automation- the ability to remotely access and control in-house appliances and machines. Because of the bandwidth increase, these applications will be even more easily available with 3G than they were previously with interim technologies such as GPRS.
SERVICE ACCESS
To use Third Generation (3G), users specifically need:
A mobile phone or terminal that supports Third Generation (3G)
A subscription to a mobile telephone network that supports Third Generation (3G)
Use of Third Generation (3G) must be enabled for that user.Automatic access to the 3G may be allowed by some mobile network operators, others will charge a monthly subscription and require a specific opt-in to use the service as they do with other nonvoice mobile services
Knowledge of how to send and/ or receive Third Generation (3G) information using their specific model of mobile phone, including software and hardware configuration (this creates a customer service requirement)
A destination to send or receive information through Third Generation (3G). From day one, Third Generation (3G) users can access any web page or other Internet applications- providing an immediate critical mass of users.
These user requirements are not expected to change much for the meaningful use of 3G.
One more link for you:
http://www.3g4u.info/features.php
@salim1001- wow thanks
hi
thanks thats very nice info by just reading ur post i got enough info and some links too thanks thats very very useful info for me i hope so for others too
thanks again salim
salim1001 said:
Check this:
3G -> Features (Source : http://www.m-indya.com/3g/3g_features.htm)
PACKET EVERYWHERE
Click to expand...
Click to collapse
I the 3G will be auctioned in India in may-June.
Hari
As far as i know our Gene does not have the capability for 3G services like HSDPA. We can have only GPRS and EDGE which are not very fast like 3G.
For our dear tech crazies : Please correct me if i am wrong.
@nelsonoski1972
Yup, you are right, but we my switch if the carriers are providing better services in 3G.
Thanks for ur [email protected]
hi
thanks for ur info i am aware of the same but i did not really understand what 3G was about ie until this thread was started and i thought their might be others like me who would like to know the same
thats my reason for this thread
But who know with people like Krazy,ankit ,Ramersonw, addicted2XDA they might device a software to make it so ie if this capability can be given to us by ways of some kind a SW(i dont know cause im not a techi) im sure these guys will do it
who know may be in the future we might get a 3G enabled Gene anything is possible rite
nelsonoski1972 said:
Hari
As far as i know our Gene does not have the capability for 3G services like HSDPA. We can have only GPRS and EDGE which are not very fast like 3G.
For our dear tech crazies : Please correct me if i am wrong.
Click to expand...
Click to collapse
Its completely impossible to enable 3G on gene, as it is a hardware capability and not software.
svrhari said:
But who know with people like Krazy,ankit ,Ramersonw, addicted2XDA they might device a software to make it so ie if this capability can be given to us by ways of some kind a SW(i dont know cause im not a techi) im sure these guys will do it
Click to expand...
Click to collapse
thanks for ur info -Xumit
hi
thanks for ur info but i did say i don't know and that im not a techi
in my last posting thanks anyway
Xumit said:
Its completely impossible to enable 3G on gene, as it is a hardware capability and not software.
Click to expand...
Click to collapse

Question about 3g & cell phone radios

This question popped to mind after reading about people buying a Canadian Vibrant and not being able to use it on T-Mobile.
If car radios etc can tune their antenna's to a certain frequency to make them work. Why is it with cell phones that the antenna/radio can't bet set to do the same thing?
Is it a physical hardware limitation?
Thanks!
Each carrier purchases bandwidth in a specific part of the electro-magnetic spectrum (TMO receives/broadcasts in a different place than say Sprint). Phone OEMs produce receiver/transmitters that can support whatever the carrier requests.
There is no financially viable reason (that I can see) for TMO to request a phone that would also work on Verizon.

VZW Extender?

I'm sure that this problem is not unique to me. I live in a small community with poor cell service. I have a vzw booster, it's placed in my living room. That way I get good service in my yard. The problem is that most people in my town have become aware of it. We have some really questionable people that have become quite a nuisance, the type of people who you don't want to know when you are home or not. It's really starting to bother my wife. We can't even sit in our living room anymore with the windows shades open. I know that this probably the best place to post this. Can anyone help me out with blocking numbers or something. I'd hate to have to unplug it, I've searched for the answer. But have officially given up. :'(
I mean really? I paid for it, shouldn't I be able to control access just like a router?
Unfortunately it is just extending the cell service frequencies. All the same rules apply that apply to a cell tower. I'm sure Verizon could control roaming of phones on the device, but any low level tech would probably deny the possibility. They probably just don't have a easy one click solution. But i would call them and complain. Tell them you have limited data on your home internet and you don't want the whole neighborhood using your service.
There is also the possibility that your extender could be a repeater of the closest tower to you, in which case you could never deny any phone service because it would also cut that phones service from the tower.
Good luck, please post any info you gather.
Sent from my SCH-I535 using xda premium
XxStechxX said:
I'm sure that this problem is not unique to me. I live in a small community with poor cell service. I have a vzw booster, it's placed in my living room. That way I get good service in my yard. The problem is that most people in my town have become aware of it. We have some really questionable people that have become quite a nuisance, the type of people who you don't want to know when you are home or not. It's really starting to bother my wife. We can't even sit in our living room anymore with the windows shades open. I know that this probably the best place to post this. Can anyone help me out with blocking numbers or something. I'd hate to have to unplug it, I've searched for the answer. But have officially given up. :'(
Click to expand...
Click to collapse
I found this in the FAQ, it may pertain to you.
Can I manage and secure access to my Network Extender?
Yes. Only the Network Extender account owner can sign in to My Verizon to manage device settings. You can set your Network Extender for Open Access or Managed Access.
Open Access allows any Verizon Wireless phone within range to use your Network Extender.
With Managed Access, you can prioritize access to your Network Extender to up to 50 Verizon Wireless callers you select. Where a compatible tower is unavailable, callers that do not appear on your Managed Access list may access the Network Extender when not in use by priority callers. All callers may access the Network Extender for emergency (E911) calls.
Also Section 2 in the manual it also mentions this.
http://support.verizonwireless.com/pdf/network_extender_user_manual.pdf
Everything I find says I can set a priority list for 50 phones, but not block. Idk

Possible to control tower selection?

Can't find an answer to this, hope someone knows. Short version is while there are many applications to monitor and track which cell tower you're on, I've not found a way to latch onto one manually.
You can on some phones (blackberry), it's quite handy if you know you're in an area where either handoffs are hard drops or you end up needlessly pingponging off the same towers. Think of being in a park for example.
Any ideas? To be clear I'm not referring to locking onto a particular provider or technology which most phones can do, rather the tower itself.

Understanding Roaming on an Android Phone

There's a debate going on on a cruise forum I'm part of and a lot of bad info is getting thrown in. I thought I'd best ask the experts here and give them a definitive answer.
As you may or may not know cruise ships have their own mobile cell to allow mobile comms (I assume using satellite tech but that's not important!). People are claiming that once you are out of reach of a terrestrial signal with roaming turned on (as you need it to be to use free data/comms in the EU) your phone automatically jumps onto the ships cell and can then incur no end of costs for use of data and/or calls and texts. I have always thought that my android mobile won't jump onto a chargeable network (i.e. one that my provider does not have a free deal with) without asking me but I'm no where near 100% sure of that.
Does anyone have the patience to explain this to me, perhaps it's even a setting in the OS somewhere?
Thanks.

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